Let’s first see some examples of Future Indefinite or Simple Future Tense.

Tom will go to London.He will sing a song.I shall study.It must rain.Let him go.
Let us go to the theatre.

Sentence Structure

Type of Sentence

Structure

Example

Affermative

Subject + will/shall/can/may (etc.) + V-I + Object

He will go to market.They will play football.

Negative

Subject + will/shall/can/may (etc.) + not + V-I + Object

He will not go to market.They will not play football.

Interrogative

Will/shall/can/may(etc.) + Subject + V-I + Object?

Will he go to market?Will they play football?

Interrogative-Negative

Will/shall/can/may(etc.) + Subject + Not + V-I + Object?

Will he not go to market?Will they not play football?

Important:

‘Shall’ is used with the First person (Shall I, Shall We)

‘Will’ is used with the second and third person (Will he, Will they, Will it, Will you)

We will study more use of shall, can, may in Modals

Let always comes in the beginning of the sentence. Let is followed by an objective pronoun (Let him, Let them, Let us). It is never followed by a subjective pronoun (Let I, Let you, Let he; these are wrong)

When we use Future Indefinite or Simple Future Tense ?

Used to talk about things which we cannot control. It expresses the future fact.Examples:I shall be 18 next Sunday.It will be Holi in a week.We will know out exam results in June.

Used to talk about what we think or believe will happen in the future. We often use it with the words like I think, I believe, I am sure, Probably, etc.Examples:I think India will win the match.I am sure Tom will get A+ in Maths.

When we decide to do something at the time of speaking.Examples:It is raining. I will take an umbrella.“Tom is very busy at the moment” – “All right I will wait.”